package com.eshop.dao.Impl;


import com.eshop.utils.JdbcUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

public abstract class BaseDao {
    private final QueryRunner queryRunner = new QueryRunner();

    public int update(String sql,Object ... args){
        Connection connection = JdbcUtils.getConnection();

        try {
            return queryRunner.update(connection,sql,args);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            JdbcUtils.close(connection);
        }

        return -1;
    }

    public <T> T queryForOne(Class<T> type,String sql,Object ... args){
        Connection connection = JdbcUtils.getConnection();

        try {
            return queryRunner.query(connection,sql,new BeanHandler<T>(type),args);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JdbcUtils.close(connection);
        }

        return null;
    }

    public <T>List<T> queryForList(Class<T> type,String sql,Object ... args){
        Connection connection = JdbcUtils.getConnection();

        try {
            return queryRunner.query(connection,sql,new BeanListHandler<T>(type),args);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JdbcUtils.close(connection);
        }

        return null;
    }

    public Object queryForSingleValue(String sql, Object ... args){
        Connection connection = JdbcUtils.getConnection();

        try {
            return queryRunner.query(connection,sql,new ScalarHandler<>(),args);
        } catch (SQLException e) {
            e.printStackTrace();
            
        } finally {
            JdbcUtils.close(connection);
        }

        return null;
    }
}
